ATIS Alerts Smart Flight Search
Find the flight least likely to be delayed
BetaWe rank real flight numbers by how often they flew and arrived on time over the last 12 months, adjusted for your travel month and departure time, then check nearby airports and calmer connections. US airlines and airports.
MDW → GRR
Chicago to Grand Rapids: 928 nonstop flights a year
On time (12 months)
76%
Cancelled
0.8%
avg delay 15 min
Best time to leave
9 AM to noon
88% on time vs 54% after 9 PM
Most reliable airline
Southwest
75% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · Southwest 3272
10:00 AM → 11:55 AM55m nonstop
Local times, typical schedule. Last flown 2026-05-31.
86%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.0%
- Avg arrival delay
- 4 min
- Arrived on time 89% of the time (55 flights, Jun 2025 to May 2026).
- Never cancelled in 55 scheduled flights.
- Leaves in this route's most on-time window (9 AM to noon: 88% on time; After 9 PM: 54%).
- Departs inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
Limited track record · 55 flights
Find Southwest 3272 fares Opens this date on Aviasales#2 · Southwest 762
10:15 AM → 12:10 PM55m nonstop
Local times, typical schedule. Last flown 2026-05-27. Same departure also flew as Southwest 3940; its record covers all of them.
85%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.0%
- Avg arrival delay
- 11 min
- Arrived on time 88% of the time (49 flights, Jun 2025 to May 2026).
- Never cancelled in 49 scheduled flights.
- Leaves in this route's most on-time window (9 AM to noon: 88% on time; After 9 PM: 54%).
- Departs inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
Limited track record · 49 flights
Find Southwest 762 fares Opens this date on Aviasales#3 · Southwest 2761
2:30 PM → 4:20 PM50m nonstop
Local times, typical schedule. Last flown 2026-04-01.
83%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 100% of the time (8 flights, Jun 2025 to May 2026).
- Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
- Short track record (8 flights), so its score leans on the airline's record at this hour.
Limited track record · 8 flights
Find Southwest 2761 fares Opens this date on Aviasales#4 · Southwest 2755
3:10 PM → 5:05 PM55m nonstop
Local times, typical schedule. Last flown 2026-05-29.
81%
chance on time
- On time (history)
- 87%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 87% of the time (23 flights, Jun 2025 to May 2026).
- Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
- Short track record (23 flights), so its score leans on the airline's record at this hour.
Limited track record · 23 flights
Find Southwest 2755 fares Opens this date on Aviasales#5 · Southwest 2111
3:25 PM → 5:15 PM50m nonstop
Local times, typical schedule. Last flown 2026-04-06.
74%
chance on time
- On time (history)
- 67%
- Cancelled
- 0.0%
- Avg arrival delay
- 19 min
- Arrived on time 67% of the time (15 flights, Jun 2025 to May 2026).
- Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
- Short track record (15 flights), so its score leans on the airline's record at this hour.
Limited track record · 15 flights
Find Southwest 2111 fares Opens this date on Aviasales#6 · Southwest 114
9:40 PM → 11:35 PM55m nonstop
Local times, typical schedule. Last flown 2026-04-06.
63%
chance on time
- On time (history)
- 63%
- Cancelled
- 3.0%
- Avg arrival delay
- 43 min
- Arrived on time 63% of the time (32 flights, Jun 2025 to May 2026).
- Cancelled 3.0% of the time (1 of 33).
- Leaves in this route's least on-time window (After 9 PM: 54% on time; 9 AM to noon: 88%).
- Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
Limited track record · 32 flights
Find Southwest 114 fares Opens this date on Aviasales#7 · Southwest 1955
9:50 PM → 11:45 PM55m nonstop
Local times, typical schedule. Last flown 2026-05-31.
55%
chance on time
- On time (history)
- 47%
- Cancelled
- 3.6%
- Avg arrival delay
- 36 min
- Arrived on time 47% of the time (53 flights, Jun 2025 to May 2026).
- Cancelled 3.6% of the time (2 of 55).
- Leaves in this route's least on-time window (After 9 PM: 54% on time; 9 AM to noon: 88%).
- Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
Limited track record · 53 flights
Find Southwest 1955 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines75%
928 flights · 76% on time as flown · 0.8% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- 9 AM to noon88%
311 flights · avg delay 7 min
- Noon to 3 PM79%
175 flights · avg delay 12 min
- 3 to 6 PM80%
81 flights · avg delay 9 min
- 6 to 9 PM74%
139 flights · avg delay 14 min
- After 9 PM54%
221 flights · avg delay 33 min
Best day: Saturday (83%). Worst: Sunday (71%).
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure